[js][student_grades][extract_class] Inject Teachers class

Author: rgomezcasas

examples/js/js-student_grades-03_extract_class/src/StudentGradeCalculator.js

@@ -1,17 +1,15 @@
-import {Teachers} from "./Teachers";
-
 export class StudentGradeCalculator {
-    constructor(yearToCalculate) {
+    constructor(yearToCalculate, teachers) {
         this.yearToCalculate = yearToCalculate;
-        this.teachers = new Teachers();
+        this.teachers        = teachers;
     }
 
     calculate(examGrades, hasReachedMinimumClasses) {
         if (examGrades.length !== 0) {
- 
+            
             let gradesSum       = 0;
             let gradesWeightSum = 0;
-    
+            
             for (let examGrade of examGrades) {
                 gradesSum += (examGrade[0] * examGrade[1] / 100);
                 gradesWeightSum += examGrade[0];

examples/js/js-student_grades-03_extract_class/tests/StudentGradeCalculator.test.js

@@ -1,8 +1,9 @@
 import {StudentGradeCalculator} from '../src/StudentGradeCalculator';
+import {Teachers} from "../src/Teachers";
 
 describe('StudentGradeCalculator should', () => {
     it('fail given there are no exams', () => {
-        const calculator = new StudentGradeCalculator(2019);
+        const calculator = new StudentGradeCalculator(2019, new Teachers(), new Teachers());
 
         const examsGrades              = [];
         const hasReachedMinimumClasses = true;
@@ -11,7 +12,7 @@ describe('StudentGradeCalculator should', () => {
     });
 
     it('calculate same grade given one single exam and attending the minimum classes', () => {
-        const calculator = new StudentGradeCalculator(2019);
+        const calculator = new StudentGradeCalculator(2019, new Teachers());
 
         const examsGrades              = [[100, 5]];
         const hasReachedMinimumClasses = true;
@@ -20,7 +21,7 @@ describe('StudentGradeCalculator should', () => {
     });
 
     it('calculate average grade given different exam grades and attending the minimum classes', () => {
-        const calculator = new StudentGradeCalculator(2019);
+        const calculator = new StudentGradeCalculator(2019, new Teachers());
 
         const examsGrades              = [
             [10, 4],
@@ -40,7 +41,7 @@ describe('StudentGradeCalculator should', () => {
     });
 
     it('round up to 2 decimals given odd exam grades and attending the minimum classes', () => {
-        const calculator = new StudentGradeCalculator(2019);
+        const calculator = new StudentGradeCalculator(2019, new Teachers());
 
         const examsGrades              = [
             [50, 4],
@@ -54,7 +55,7 @@ describe('StudentGradeCalculator should', () => {
     // hasReachedMinimumClasses
 
     it('fail when there are no exams and has not attended the minimum classes', () => {
-        const calculator = new StudentGradeCalculator(2019);
+        const calculator = new StudentGradeCalculator(2019, new Teachers());
 
         const examsGrades              = [];
         const hasReachedMinimumClasses = false;
@@ -63,7 +64,7 @@ describe('StudentGradeCalculator should', () => {
     });
 
     it('fail given one single exam but not attending the minimum classes', () => {
-        const calculator = new StudentGradeCalculator(2019);
+        const calculator = new StudentGradeCalculator(2019, new Teachers());
 
         const examsGrades              = [[100, 5]];
         const hasReachedMinimumClasses = false;
@@ -72,7 +73,7 @@ describe('StudentGradeCalculator should', () => {
     });
 
     it('fail given different exam grades but not attending the minimum classes', () => {
-        const calculator = new StudentGradeCalculator(2019);
+        const calculator = new StudentGradeCalculator(2019, new Teachers());
 
         const examsGrades              = [
             [10, 4],
@@ -92,7 +93,7 @@ describe('StudentGradeCalculator should', () => {
     });
 
     it('fail given odd exam grades but not attending the minimum classes', () => {
-        const calculator = new StudentGradeCalculator(2019);
+        const calculator = new StudentGradeCalculator(2019, new Teachers());
 
         const examsGrades              = [[50, 5], [50, 4]];
         const hasReachedMinimumClasses = false;
@@ -103,7 +104,7 @@ describe('StudentGradeCalculator should', () => {
     // Weight
 
     it('validate all exam grades weight below 100', () => {
-        const calculator = new StudentGradeCalculator(2019);
+        const calculator = new StudentGradeCalculator(2019, new Teachers());
 
         const examsGrades              = [
             [10, 4],
@@ -115,7 +116,7 @@ describe('StudentGradeCalculator should', () => {
     });
 
     it('validate all exam grades weight over 100', () => {
-        const calculator = new StudentGradeCalculator(2019);
+        const calculator = new StudentGradeCalculator(2019, new Teachers());
 
         const examsGrades              = [
             [90, 4],
@@ -129,7 +130,7 @@ describe('StudentGradeCalculator should', () => {
     // hasToRaiseOnePoint
 
     it('not increase one extra point if there is not any benevolent teacher in the year to calculate grades', () => {
-        const calculator = new StudentGradeCalculator(2019);
+        const calculator = new StudentGradeCalculator(2019, new Teachers());
 
         const examsGrades              = [[100, 9.8]];
         const hasReachedMinimumClasses = true;
@@ -138,7 +139,7 @@ describe('StudentGradeCalculator should', () => {
     });
 
     it('increase one extra point if there is any benevolent teacher in the year to calculate grades', () => {
-        const calculator = new StudentGradeCalculator(2020);
+        const calculator = new StudentGradeCalculator(2020, new Teachers());
 
         const examsGrades              = [[100, 5]];
         const hasReachedMinimumClasses = true;
@@ -147,7 +148,7 @@ describe('StudentGradeCalculator should', () => {
     });
 
     it('maintain 10 as the maximum grade even if increasing one extra point', () => {
-        const calculator = new StudentGradeCalculator(2020);
+        const calculator = new StudentGradeCalculator(2020, new Teachers());
 
         const examsGrades              = [[100, 9.8]];
         const hasReachedMinimumClasses = true;